Albert bingham



ALBERT BIN GAM, 0F NEWTON VILLE, .MASSACHUSETTS Letters Patent No. 74,746, datedl February 25, 1868; aratedated February 7,1868.

IMPROVEMENT IN KNOB-LATGlzllilS FOR DOORS.

fitte tlgehul referat tu in tten Elettra tntmt ma mating pnt nf tige stmt.

`Be it known that'I, LBERTBINGHAM, of'Newtonville, in the county of Middlesex, and State of Massachusette, have inventedan-Improv'ed Door-Latch, whichV I term a Bit-Hole Latch, of which the following is a full,

clear, 'and exact descript-ion, reference lbeing had to the accompanying drawing, making a part of this specification, in which-- I i i Figure 1 represents a plan view of the latch within the door.

Figure 2 is a side view of the same; 4and Figures?) is the front end of a door, Vshowing a bithole, in which the latch is inserted.

My invention consists in constructing a latch which is actuated by the contraction of a spring, attached at` one end to a projection or ho'ok on the face-plate on the edge of thedoor, and at the other end to an inner part of the latch, the latter being moved by means of a tumbler attached to or placed uponv the spindle to which the handles are secured, and the whole occupying alsp'ace which will admit of its being fitted in a bit-hole made 4 through the edge of the door.

Referring to 'the drawings, represents a portion of the door, in which the latch is fitted. Ahole is made with an auger ofv the required size in the edge of thc door, as indicatedA at H, fig. 3, into which the latch is inserted. VB C is the latch, formed in the shapeof an oblongvlink, as seen on its upper edge in tig. 1, with the catch b on its outer end." Its rear end,'C, is formed as shown, with a projecting arm, c, which overlaps ,and

vretains the tumbler Dvin place, yet admits of its ready removal. The tumbler D consists of asemicircular plato of metal, provided with a square opening, in which is fitted the spindle forthe handles, and with two shoulders, so that one of them will press against a portion of the part C of the latchwh'en the latter is to be retracted,

which is effected by turning the handle, as usuah The curved end of the opposite side of'the disk, when the` same is turned to retract the latch, will abut vagainst a cross-piece, e, on the latch at its rear, so as to prevent it from turning any further than is necessary to retract the latch sufficiently. To the cross-piece e of the latch is attached one end of. a coiled spring',` S, its other or front end being attached to a projection orfhook, d,`

secured to the face-plateau the front edge ofthe door, through whichthe catch passes.N The said spring serves 'to keep thelatch projected; In iig. 1, 'the'portion .colored yellow shows Vthe latch in'a retracted position, and that in red in a projected or normalposition.

The latch is xed in the door by-rstrinsertingit withinthe bit-hole H. The tumblerD is then dropped,` l

within a hole in the side, when the stemy is passed through the door, andl ts within a recess in the latch, the latch being irst retractedto receive it. The'spindle being then passed through the latch and door, th'ehandles are secured as in the usual manner. w i

The latch, it will be seen, is of very cheap and simples construction, and is very simple and edicient in operation, and not liable toget out of order. It occupiesV but av small spac'e, and, instead of requiring a mortise, is easily and quickly tted within a hole made by an ordinary bit.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is The combination and arrangement ofthe latch, having link -1 3 and armed end C, the removable tumbler D, and spring S, when the parts are constructcdaud operating substantially as described. i j In testimony whereo`,I have signed my name to this speciication in the presence of two subscribing witnesses.

ALBERT BIN GHAM.

Witnesses: j

J. H. ADAMS, DAVID KELLEHER. 

